Re: IIgs RGB to VGA experiment

["Bryan Parkoff" <none@nospam.net>]

"Michael J. Mahon" <mjmahon@aol.com> wrote in message 
GvqdnaXCGZ5gGPrZ4p2dnA@comcast.com">news:GvqdnaXCGZ5gGPrZ4p2dnA@comcast.com...
> js@cimmeri.com wrote:
>> Following up to an older post re what monitors can be used with the
>> IIgs, I recently ordered an RGB to VGA converter from this place in
>> Australia:
>>
>> http://www.converters.tv/products/converters/rgb_converters/41.html
>>
>> This item performs the conversion from 15.75khz / 60hz to 31.5khz / 60
>> hz, as well as the RGB to RGBHV.
>>
>> It has arrived and I'll report back here how it works.   I'm awaiting a
>> DB-15 connector and 5v power supply from Jameco.   Testing will be done
>> with an early IBM VGA 31khz CRT monitor 6112.
>
> You could just tap into the +5v supply in the IIgs--this looks like a
> good candidate to be installed inside the IIgs case.  You could connect
> to the RGB signals inside the case, and skip the DB-15 connector.
>
> It will be very interesting to hear your results.
>
> -michael
>
> Music synthesis for 8-bit Apple II's!
> Home page:  http://members.aol.com/MJMahon/
>
> "The wastebasket is our most important design
> tool--and it is seriously underused."

Hello,

    I humble to tell you since I had discussed with Michael Mahon for some 
decade.  I thought the same board on the website that you provided.  I did 
give the same website to him.  He and I had agreed that this RGB, CGA to VGA 
converter board may not work Apple IIgs' video port because it will not lock 
the resolution correctly which 560x192 is very different than 640x200.  It 
might work GS/OS as super resolution, but it will not work Apple II's 
standard modes.
    I was ready to purchase the same board what you bought already, but I 
have decided to follow Michael's advice not to purchase it.  I want to say 
good luck to you.  It is only a hope if you can succeed.  We will be more 
than happy to hear your experiment.

Bryan Parkoff